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I had this issue once, turned out to be a grounding issue. Remove the motherboard, place it on a piece of cardboard, connect all needed parts (power, hard, memory, video, cd drive. Now try to power it up. If it comes up go to a home improvement store and buy some rubber or paper washers to place between the motherboard and case, were the mounting screws go.
This is really poor practice and an excellent way to destroy a motherboard.
You should always have the board connectors plugged in before turning on the power supply, otherwise you may be blowing ICs left and right.
It's perfectly OK to plug the supply into the wall or turn on its power switch with the board connectors in place.
Also, nearly all modern boards have a set of pins that go to the front panel 'power' switch which does not switch AC but sends a logic signal to the power supply to turn the rest of the voltages on.
Those pins have a 5V potential on them that is typically grounded to tell the supply to turn on.
If you're lucky, you still have an undamaged motherboard.
Try swapping the power button connection with the reset button connection. Then to turn on your computer you will need to press the reset button. If that works you have a faulty power button. Otherwise try using a different PSU. One that you know works. If that doesn't help the motherboard will have to be replaced.
when you say not coming up meaning not turning on?
>If its not turning on and no lights even on power button but monitor is powered up try swapping power cable of monitor to your tower to check if its just power cable issue
> if still not turning on and no lights at all then you have problem on power supply
> please advise me if the computer gets light because youre problem might be caused by a different thing if the system is turning on but its not booting to windows so please provide complete details of the problem
Your question fails to provide sufficient information.
.."doesn;t turn on power good...." do any lights on the pc illuminate was it working before, and did it close down correctly has it possibly been hit by lightning have you recently opened the case to install new hardware?
Possible causes of a failed power up. dead power supply a video card not seated in its slot correctly dud motherboard motherboard installed incorrectly no Bios battery on motherboard faulty wall switch faulty power pack switch no ram installed
may be the RAM of the computer is decreased during transfer withput ur knowledge . u know what was the previous amount of RAM ur computer had and check in system properties if the same squantity of ram is available . this may have slow don the sytem , try to remove unwanted starup options also